(1)y=(x-500)×50%=x-250,(500<x≤10000);
(2)设实际医疗费用为x元, 依题意得x-(x-250)=2000,解得x=3500, 答:刘爷爷当年实际医疗费用是3500元;
(3)∵500+0.5×(10000-500)=5250<6250, ∴刘爷爷实际医疗费用超过了10000元, 设刘爷爷实际医疗费用为x元,依题意得: 500+(10000-500)×50%+(x-10000)(1-60%)≥6250, 解得x≥12500. 答:刘爷爷实际医疗费用至少是12500元时,自付费用不少于6250元. |